Henry e



(No Model.)

H. E. WAITE.

TELEPHONE TRANSMITTER. No. 298,923. Patented May 20, 1884.

I III/l [001% HIE Wi mn lllll Attorney llirt:

ATENT HENRY E. \VAITE, OF NEXV YORK, N. Y., ASSIGNOR TO CHARLES F. LIVERMORE, TRUSTEE, OF SAME PLACE.

TELEPHONE- -TRANSM ITTER.

SPECIFICATION forming part of Letters Patent NO. 298,923, dated May 20, 1884:. Application filed October 4, 1883. (No model.)

To ctZZ whom it may concern.-

Be it known that I, HENRY E. WAITE, of the city, county, and State of New York, have invented a new and useful Improvement in Telephone-Transmitters, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

My invention relates to a novel construction of telephone-transmitters, and will be best undestood from the following description, with' reference to the accompanying drawings, in which- Figure 1 represents a vertical section through a transmitter embracing my improvements, and Fig. 2 a bottom view of the electrodes detached.

A. represents the box or case of the transmitter, said case being made in any suitable form and of any usual or preferred material, and provided at or near the centerof its length or height with a perforated transverse partition, A, with which the smaller end of a conical or funnel-shaped mouth-piece or tube, B, is connected, the opposite larger end of said tube passing out through the wall of the case above the partition A and forming the mouth-piece.

Just underneath the partition A is a rabbeted ledge, a, conforming to the inner wall of the case and passing entirely around the same, and within the rabbeted or shouldered portion a of said ledge is fitted a plate of wood, cork, or other suitable material, 0, adapted to fill the space provided for it sufficien tly closely to prevent lateral play or displacement of the plate, but not so grasped or bound by said ledge as to interfere with its vibration under the action of the sound-waves. This plate, when in place, lies just underneath the partition A, said plate and its supporting-ledge forming a second partition, a shallow air-space being left between the two partitions, as shown.

From the center of the plate 0, and directly under the adjacent end of the tube 13, is sus pended a plate, D, of metal, provided with a central upright pin, (2, which passes through the plate 0, and is secured thereto by a nut on its upper end. The metal plate D,by prefcrence,is rectangular in form, and is provided on its lower face and at opposite sides or ends with pendent lugs or ears (2 d", arranged in pairs, as shown, and to these are pivoted the upper ends of two pendent plates, E and E, which may be made of metal, carbon, or other material suitable for electrodes; or they may be made of wood or cork, with plates or strips 6, of carbomor metal, secured to them near their lower swinging ends, in which case the plates 6 will be connected by suitable conductors, c, with the metal plate D.

F is a T-shaped rod or bar, made of any suitable metal which will serve as a conductor, wit-h its rounded upright portion passing through a perforation in the bottom A of the case, and provided at f with a screw-thread, which works in a nut, g, secured to said bottom A The upper end or cross-head,f, of the rod or bar F is between the lower swinging ends of the plates E, or between the carbon plates 0 thereon, and serves, as the standard portion is turned in the nut or support 9, to adjust the plates outward more or less from their normal vertical position, an d thereby to cause them to press more or less firmly or heavily against the ends of the cross-head f, thereby making the points of contact between the electrodes more or less sensitive, as may be required. The ends of the cross-head fare by preference tipped with platinum or carbon, but, the entire piece F being of suitable conducting material, this is not essential.

The not 9 is shown attached at the bottom A 'by bolts passing through said bottom, a flange on the nut, and through a metal plate, 9, resting on said bottom; but it may be secured in any suitable manner. A jam-nut, 9", on the threaded portion f of the bar F below the nut serves to lock the rod f with the cross-head and the plates E and. E at any desired adjustment. WVires h and h extend, one, 71, from the shank of bar F or from the nut g or plate 9 to the battery, (indicated at 1,) and thence to the primary of coil J, the other, it, from the plate 1) to said primary, the secondary of said coil being connected with binding-postslaud Z, and thence with the line and receiver in any suitable manner.

The pendent plates or electrodes E and E should be of such width as to accommodate the movement of the cross-headf without endangering their being caught by the sides of the latter, in order to adapt them to be moved from a vertical or nearly vertical position to one in which they are considerably deflected from such vertical position, for varying their pressure upon the ends of the cross-head, and consequent sensitiveness of contact therewith,

as desired.

I am aware that a series of independentlypivoted simple electrodes resting by gravity against an electrode attached to the diaphragm or sound-board have been employed in a telephone-transmitter. This I do not claim; but,

Having now described my invention, I claim as new, viz: 7

1. In a telephone-transmitter, an electrode suspended from the sound-board and having ahinged pendent section, in combination with a second electrode adapted to be adjusted for varying the pressure of the hinged pendent section upon it, substantially as described.

2. In a telephone-transmitter, the combination of the sound board or plate 0, the electrode consisting of the plate D and hinged plates E and E, suspended from said soundboard,and the electrode F, provided with the cross-head f, interposed and adjustable be tween the pendent plates E and E, substantially as described.

3. The combination, with the transmittercase A, provided with the perforated partition.

HENRY E. VVAITE.

Witnesses:

G. H. HANKINSON, J. A. GAPoUILLIEz. 

